Winklevoss Twins: Facebook IPO

Zuckerberg's Harvard classmates, the Winklevoss twins, co-founded the social networking site ConnectU (originally called HarvardConnection). The brothers later sued Zuckerberg for $140 million, claiming he stole their idea to create Facebook. The suit was settled in 2008 for a reported $65 million. In May 2010, the pair filed another suit against Facebook for securities fraud on the value of the stock that was part of the settlement. A federal appeals court judge affirmed the lower court's ruling, and the Winklevosses have since ended their legal battle.

Since graduating from Harvard, the twins earned MBAs from Oxford University and competed on the U.S. rowing team in the 2008 Summer Olympics in Beijing. Earlier this year, they formed a venture capital firm called Winklevoss Capital, through which they intend to fund technology startups.